@book{75730,
	author = {Johnson, Orlen N. and Thomson, Evelyn M.},
	title = {Essentials of dental radiography for dental assistants and hygienists.},
	publisher = {Pearson Prentice Hall,},
	year = {2007.},
	address = {Upper Saddle River:},
	edition = {8th ed. /},
	url = {http://www.loc.gov/catdir/toc/ecip0610/2006008912.html}
}